<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="大熊头条"
      @click-left="$router.back()"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_anme }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>
          <!-- 这里的$event是子组件传来的事件参数 -->
          <!-- 当我们传递给子组件的数据既要使用又要修改
            传递：props；
            :isArticleFllow="article.is_followed"
            修改：自定义事件
            @update-isArticleFllow="article.is_followed = $event"
            这样显得比较麻烦 我们可以优化简写 在组件上使用v-model
            相当于v-model替换了子组件中的以下两代码：
            value="article.is_followed"
            @input="article.is_followed = $event"-->
          <!-- 子组件 -->
          <focus-user
            v-model="article.is_followed"
            :userId="article.aut_id"
            class="follow-btn"
          ></focus-user>
          <!-- 此区域已经封装成单独组建 focus-user -->
          <!-- <van-button
            v-if="article.is_followed"
            class="follow-btn"
            round
            size="small"
            :loading="followLoading"
            @click="fllowBtns"
            >已关注</van-button
          >
          <van-button
            v-else
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            size="small"
            icon="plus"
            :loading="followLoading"
            @click="fllowBtns"
            >关注</van-button
          > -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          class="article-content markdown-body"
          v-html="article.content"
          ref="articleContentRef"
        ></div>
        <van-divider>正文结束</van-divider>
        <!-- 文章评论列表 -->
        <comment-list
          :source="article.art_id"
          :list="commentList"
          @getCommentCount="totalCount = $event.total_count"
          @reply-click="onReplyClick"
        ></comment-list>
        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
            @click="isPostShow = true"
            >写评论</van-button
          >
          <van-icon name="comment-o" :info="totalCount" color="#777" />
          <!-- <van-icon color="#777" name="star-o" /> -->
          <!-- 收藏子组件 -->
          <collect-article
            class="btn-item"
            v-model="article.is_collected"
            :articleId="article.art_id"
          ></collect-article>
          <!-- 点赞子组件 -->
          <like-article
            class="btn-item"
            v-model="article.attitude"
            :articleId="article.art_id"
          ></like-article>
          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->
        <!-- 评论弹出层 -->
        <van-popup v-model="isPostShow" position="bottom">
          <comment-post
            :target="article.art_id"
            @replaySuccess="onReplaySuccess"
          ></comment-post>
        </van-popup>
        <!-- 评论弹出层 -->
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="errStatus === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button @click="loadArticle" class="retry-btn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>
    <!-- 评论回复弹出层开始 -->
    <van-popup v-model="isreplayShow" position="bottom" style="height:100%">
      <comment-reply
        v-if="isreplayShow"
        :comment="currentComment"
        @close="isreplayShow = false"
      ></comment-reply>
    </van-popup>
    <!-- 评论回复弹出层结束 -->
  </div>
</template>

<script>
import { getArticleInfos } from '@/api/article.js'
import { ImagePreview } from 'vant'
import FocusUser from '@/components/focus-user/index.vue'
// import { getFocus, deleteFocus } from '@/api/user.js'
import CollectArticle from '@/components/collect-article/index.vue'
import LikeArticle from '@/components/like-article/index.vue'
import CommentList from './components/comment-list'
import CommentPost from './components/comment-post'
import CommentReply from './components/comment-reply'
export default {
  name: 'ArticleIndex',
  components: {
    FocusUser,
    CollectArticle,
    LikeArticle,
    CommentList,
    CommentPost,
    CommentReply
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  // 依赖注入 给所有的后代组件提供数据
  provide: function() {
    return {
      articleId: this.articleId
    }
  },
  data() {
    return {
      article: {}, // 文章详情
      loading: true, // 加载中默认显示状态
      errStatus: 0, // 加载失败的两种错误状态
      // followLoading: false // 控制关注和取消关注按钮的旋转状态显示
      totalCount: 0,
      isPostShow: false, // 评论弹出层显示与否
      commentList: [], // 评论列表
      isreplayShow: false, // 评论回复弹窗
      currentComment: {} // 存储子组件的子组件传过来的值，供另一个子组件使用
    }
  },
  computed: {},
  watch: {},
  created() {
    this.loadArticle(this.articleId)
  },
  mounted() {},
  methods: {
    async loadArticle(id) {
      // 一打开界面默认显示加载中
      this.loading = true
      try {
        const { data } = await getArticleInfos(id)
        this.article = data.data
        // 加载成功后让加载中隐藏
        this.loading = false
        // 加载成功后获取图片地址
        setTimeout(() => {
          this.getImgs()
        }, 0)
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errStatus = 404
        }
        // 获取数据失败后让加载中隐藏
        this.loading = false
      }
    },
    // 获取文章中所有图片地址
    getImgs() {
      const articleContent = this.$refs.articleContentRef
      const imgs = articleContent.querySelectorAll('img')
      const images = []
      imgs.forEach((img, index) => {
        images.push(img.src)
        img.onclick = () => {
          ImagePreview({
            // 预览的图片地址
            images,
            // 图片预览的起始位置
            startPosition: index
          })
        }
      })
    },
    // 评论发布成功 由子组件触发事件到这里
    onReplaySuccess(data) {
      // 关闭弹出层
      this.isPostShow = false
      // 将发布信息置顶显示
      this.commentList.unshift(data.new_obj)
    },
    onReplyClick(comment) {
      // 显示回复评论弹出层
      this.currentComment = comment
      this.isreplayShow = true
    }
  }
}
</script>

<style scoped lang="less">
@import './github-markdown.css';
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    /deep/.van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
